elan_i2c_core.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Elan I2C/SMBus Touchpad driver
   4 *
   5 * Copyright (c) 2013 ELAN Microelectronics Corp.
   6 *
   7 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
   8 * Author: KT Liao <kt.liao@emc.com.tw>
   9 * Version: 1.6.3
  10 *
  11 * Based on cyapa driver:
  12 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  13 * copyright (c) 2011-2012 Google, Inc.
  14 *
  15 * Trademarks are the property of their respective owners.
  16 */
  17
  18#include <linux/acpi.h>
  19#include <linux/delay.h>
  20#include <linux/device.h>
  21#include <linux/firmware.h>
  22#include <linux/i2c.h>
  23#include <linux/init.h>
  24#include <linux/input/mt.h>
  25#include <linux/interrupt.h>
  26#include <linux/irq.h>
  27#include <linux/module.h>
  28#include <linux/slab.h>
  29#include <linux/kernel.h>
  30#include <linux/sched.h>
  31#include <linux/string_choices.h>
  32#include <linux/input.h>
  33#include <linux/uaccess.h>
  34#include <linux/jiffies.h>
  35#include <linux/completion.h>
  36#include <linux/of.h>
  37#include <linux/pm_wakeirq.h>
  38#include <linux/property.h>
  39#include <linux/regulator/consumer.h>
  40#include <linux/unaligned.h>
  41
  42#include "elan_i2c.h"
  43
  44#define DRIVER_NAME		"elan_i2c"
  45#define ELAN_VENDOR_ID		0x04f3
  46#define ETP_MAX_PRESSURE	255
  47#define ETP_FWIDTH_REDUCE	90
  48#define ETP_FINGER_WIDTH	15
  49#define ETP_RETRY_COUNT		3
  50
  51/* quirks to control the device */
  52#define ETP_QUIRK_QUICK_WAKEUP	BIT(0)
  53
  54/* The main device structure */
  55struct elan_tp_data {
  56	struct i2c_client	*client;
  57	struct input_dev	*input;
  58	struct input_dev	*tp_input; /* trackpoint input node */
  59	struct regulator	*vcc;
  60
  61	const struct elan_transport_ops *ops;
  62
  63	/* for fw update */
  64	struct completion	fw_completion;
  65	bool			in_fw_update;
  66
  67	struct mutex		sysfs_mutex;
  68
  69	unsigned int		max_x;
  70	unsigned int		max_y;
  71	unsigned int		width_x;
  72	unsigned int		width_y;
  73	unsigned int		x_res;
  74	unsigned int		y_res;
  75
  76	u8			pattern;
  77	u16			product_id;
  78	u8			fw_version;
  79	u8			sm_version;
  80	u8			iap_version;
  81	u16			fw_checksum;
  82	unsigned int		report_features;
  83	unsigned int		report_len;
  84	int			pressure_adjustment;
  85	u8			mode;
  86	u16			ic_type;
  87	u16			fw_validpage_count;
  88	u16			fw_page_size;
  89	u32			fw_signature_address;
  90
  91	u8			min_baseline;
  92	u8			max_baseline;
  93	bool			baseline_ready;
  94	u8			clickpad;
  95	bool			middle_button;
  96
  97	u32			quirks;		/* Various quirks */
  98};
  99
 100static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
 101{
 102	static const struct {
 103		u16 ic_type;
 104		u16 product_id;
 105		u32 quirks;
 106	} elan_i2c_quirks[] = {
 107		{ 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
 108		{ 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
 109		{ 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
 110		{ 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
 111		{ 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
 112	};
 113	u32 quirks = 0;
 114	int i;
 115
 116	for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
 117		if (elan_i2c_quirks[i].ic_type == ic_type &&
 118		    elan_i2c_quirks[i].product_id == product_id) {
 119			quirks = elan_i2c_quirks[i].quirks;
 120		}
 121	}
 122
 123	if (ic_type >= 0x0D && product_id >= 0x123)
 124		quirks |= ETP_QUIRK_QUICK_WAKEUP;
 125
 126	return quirks;
 127}
 128
 129static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
 130			   u32 *signature_address, u16 *page_size)
 131{
 132	switch (ic_type) {
 133	case 0x00:
 134	case 0x06:
 135	case 0x08:
 136		*validpage_count = 512;
 137		break;
 138	case 0x03:
 139	case 0x07:
 140	case 0x09:
 141	case 0x0A:
 142	case 0x0B:
 143	case 0x0C:
 144		*validpage_count = 768;
 145		break;
 146	case 0x0D:
 147		*validpage_count = 896;
 148		break;
 149	case 0x0E:
 150		*validpage_count = 640;
 151		break;
 152	case 0x10:
 153		*validpage_count = 1024;
 154		break;
 155	case 0x11:
 156		*validpage_count = 1280;
 157		break;
 158	case 0x13:
 159		*validpage_count = 2048;
 160		break;
 161	case 0x14:
 162	case 0x15:
 163		*validpage_count = 1024;
 164		break;
 165	default:
 166		/* unknown ic type clear value */
 167		*validpage_count = 0;
 168		*signature_address = 0;
 169		*page_size = 0;
 170		return -ENXIO;
 171	}
 172
 173	*signature_address =
 174		(*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
 175
 176	if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
 177		*validpage_count /= 8;
 178		*page_size = ETP_FW_PAGE_SIZE_512;
 179	} else if (ic_type >= 0x0D && iap_version >= 1) {
 180		*validpage_count /= 2;
 181		*page_size = ETP_FW_PAGE_SIZE_128;
 182	} else {
 183		*page_size = ETP_FW_PAGE_SIZE;
 184	}
 185
 186	return 0;
 187}
 188
 189static int elan_set_power(struct elan_tp_data *data, bool on)
 190{
 191	int repeat = ETP_RETRY_COUNT;
 192	int error;
 193
 194	do {
 195		error = data->ops->power_control(data->client, on);
 196		if (error >= 0)
 197			return 0;
 198
 199		msleep(30);
 200	} while (--repeat > 0);
 201
 202	dev_err(&data->client->dev, "failed to set power %s: %d\n",
 203		str_on_off(on), error);
 204	return error;
 205}
 206
 207static int elan_sleep(struct elan_tp_data *data)
 208{
 209	int repeat = ETP_RETRY_COUNT;
 210	int error;
 211
 212	do {
 213		error = data->ops->sleep_control(data->client, true);
 214		if (!error)
 215			return 0;
 216
 217		msleep(30);
 218	} while (--repeat > 0);
 219
 220	return error;
 221}
 222
 223static int elan_query_product(struct elan_tp_data *data)
 224{
 225	int error;
 226
 227	error = data->ops->get_product_id(data->client, &data->product_id);
 228	if (error)
 229		return error;
 230
 231	error = data->ops->get_pattern(data->client, &data->pattern);
 232	if (error)
 233		return error;
 234
 235	error = data->ops->get_sm_version(data->client, data->pattern,
 236					  &data->ic_type, &data->sm_version,
 237					  &data->clickpad);
 238	if (error)
 239		return error;
 240
 241	return 0;
 242}
 243
 244static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
 245{
 246	if (data->ic_type == 0x0E) {
 247		switch (data->product_id) {
 248		case 0x05 ... 0x07:
 249		case 0x09:
 250		case 0x13:
 251			return true;
 252		}
 253	} else if (data->ic_type == 0x08 && data->product_id == 0x26) {
 254		/* ASUS EeeBook X205TA */
 255		return true;
 256	}
 257
 258	return false;
 259}
 260
 261static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
 262{
 263	struct i2c_client *client = data->client;
 264	bool woken_up = false;
 265	int error;
 266
 267	if (!skip_reset) {
 268		error = data->ops->initialize(client);
 269		if (error) {
 270			dev_err(&client->dev, "device initialize failed: %d\n", error);
 271			return error;
 272		}
 273	}
 274
 275	error = elan_query_product(data);
 276	if (error)
 277		return error;
 278
 279	/*
 280	 * Some ASUS devices were shipped with firmware that requires
 281	 * touchpads to be woken up first, before attempting to switch
 282	 * them into absolute reporting mode.
 283	 */
 284	if (elan_check_ASUS_special_fw(data)) {
 285		error = data->ops->sleep_control(client, false);
 286		if (error) {
 287			dev_err(&client->dev,
 288				"failed to wake device up: %d\n", error);
 289			return error;
 290		}
 291
 292		msleep(200);
 293		woken_up = true;
 294	}
 295
 296	data->mode |= ETP_ENABLE_ABS;
 297	error = data->ops->set_mode(client, data->mode);
 298	if (error) {
 299		dev_err(&client->dev,
 300			"failed to switch to absolute mode: %d\n", error);
 301		return error;
 302	}
 303
 304	if (!woken_up) {
 305		error = data->ops->sleep_control(client, false);
 306		if (error) {
 307			dev_err(&client->dev,
 308				"failed to wake device up: %d\n", error);
 309			return error;
 310		}
 311	}
 312
 313	return 0;
 314}
 315
 316static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
 317{
 318	int repeat = ETP_RETRY_COUNT;
 319	int error;
 320
 321	do {
 322		error = __elan_initialize(data, skip_reset);
 323		if (!error)
 324			return 0;
 325
 326		skip_reset = false;
 327		msleep(30);
 328	} while (--repeat > 0);
 329
 330	return error;
 331}
 332
 333static int elan_query_device_info(struct elan_tp_data *data)
 334{
 335	int error;
 336
 337	error = data->ops->get_version(data->client, data->pattern, false,
 338				       &data->fw_version);
 339	if (error)
 340		return error;
 341
 342	error = data->ops->get_checksum(data->client, false,
 343					&data->fw_checksum);
 344	if (error)
 345		return error;
 346
 347	error = data->ops->get_version(data->client, data->pattern,
 348				       true, &data->iap_version);
 349	if (error)
 350		return error;
 351
 352	error = data->ops->get_pressure_adjustment(data->client,
 353						   &data->pressure_adjustment);
 354	if (error)
 355		return error;
 356
 357	error = data->ops->get_report_features(data->client, data->pattern,
 358					       &data->report_features,
 359					       &data->report_len);
 360	if (error)
 361		return error;
 362
 363	data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
 364
 365	error = elan_get_fwinfo(data->ic_type, data->iap_version,
 366				&data->fw_validpage_count,
 367				&data->fw_signature_address,
 368				&data->fw_page_size);
 369	if (error)
 370		dev_warn(&data->client->dev,
 371			 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
 372			 data->iap_version, data->ic_type);
 373
 374	return 0;
 375}
 376
 377static unsigned int elan_convert_resolution(u8 val, u8 pattern)
 378{
 379	/*
 380	 * pattern <= 0x01:
 381	 *	(value from firmware) * 10 + 790 = dpi
 382	 * else
 383	 *	((value from firmware) + 3) * 100 = dpi
 384	 */
 385	int res = pattern <= 0x01 ?
 386		(int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
 387	/*
 388	 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
 389	 * point).
 390	 */
 391	return res * 10 / 254;
 392}
 393
 394static int elan_query_device_parameters(struct elan_tp_data *data)
 395{
 396	struct i2c_client *client = data->client;
 397	unsigned int x_traces, y_traces;
 398	u32 x_mm, y_mm;
 399	u8 hw_x_res, hw_y_res;
 400	int error;
 401
 402	if (device_property_read_u32(&client->dev,
 403				     "touchscreen-size-x", &data->max_x) ||
 404	    device_property_read_u32(&client->dev,
 405				     "touchscreen-size-y", &data->max_y)) {
 406		error = data->ops->get_max(data->client,
 407					   &data->max_x,
 408					   &data->max_y);
 409		if (error)
 410			return error;
 411	} else {
 412		/* size is the maximum + 1 */
 413		--data->max_x;
 414		--data->max_y;
 415	}
 416
 417	if (device_property_read_u32(&client->dev,
 418				     "elan,x_traces",
 419				     &x_traces) ||
 420	    device_property_read_u32(&client->dev,
 421				     "elan,y_traces",
 422				     &y_traces)) {
 423		error = data->ops->get_num_traces(data->client,
 424						  &x_traces, &y_traces);
 425		if (error)
 426			return error;
 427	}
 428	data->width_x = data->max_x / x_traces;
 429	data->width_y = data->max_y / y_traces;
 430
 431	if (device_property_read_u32(&client->dev,
 432				     "touchscreen-x-mm", &x_mm) ||
 433	    device_property_read_u32(&client->dev,
 434				     "touchscreen-y-mm", &y_mm)) {
 435		error = data->ops->get_resolution(data->client,
 436						  &hw_x_res, &hw_y_res);
 437		if (error)
 438			return error;
 439
 440		data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
 441		data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
 442	} else {
 443		data->x_res = (data->max_x + 1) / x_mm;
 444		data->y_res = (data->max_y + 1) / y_mm;
 445	}
 446
 447	if (device_property_read_bool(&client->dev, "elan,clickpad"))
 448		data->clickpad = 1;
 449
 450	if (device_property_read_bool(&client->dev, "elan,middle-button"))
 451		data->middle_button = true;
 452
 453	return 0;
 454}
 455
 456/*
 457 **********************************************************
 458 * IAP firmware updater related routines
 459 **********************************************************
 460 */
 461static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
 462			       const u8 *page, u16 checksum, int idx)
 463{
 464	int retry = ETP_RETRY_COUNT;
 465	int error;
 466
 467	do {
 468		error = data->ops->write_fw_block(data->client, page_size,
 469						  page, checksum, idx);
 470		if (!error)
 471			return 0;
 472
 473		dev_dbg(&data->client->dev,
 474			"IAP retrying page %d (error: %d)\n", idx, error);
 475	} while (--retry > 0);
 476
 477	return error;
 478}
 479
 480static int __elan_update_firmware(struct elan_tp_data *data,
 481				  const struct firmware *fw)
 482{
 483	struct i2c_client *client = data->client;
 484	struct device *dev = &client->dev;
 485	int i, j;
 486	int error;
 487	u16 iap_start_addr;
 488	u16 boot_page_count;
 489	u16 sw_checksum = 0, fw_checksum = 0;
 490
 491	error = data->ops->prepare_fw_update(client, data->ic_type,
 492					     data->iap_version,
 493					     data->fw_page_size);
 494	if (error)
 495		return error;
 496
 497	iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
 498
 499	boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
 500	for (i = boot_page_count; i < data->fw_validpage_count; i++) {
 501		u16 checksum = 0;
 502		const u8 *page = &fw->data[i * data->fw_page_size];
 503
 504		for (j = 0; j < data->fw_page_size; j += 2)
 505			checksum += ((page[j + 1] << 8) | page[j]);
 506
 507		error = elan_write_fw_block(data, data->fw_page_size,
 508					    page, checksum, i);
 509		if (error) {
 510			dev_err(dev, "write page %d fail: %d\n", i, error);
 511			return error;
 512		}
 513
 514		sw_checksum += checksum;
 515	}
 516
 517	/* Wait WDT reset and power on reset */
 518	msleep(600);
 519
 520	error = data->ops->finish_fw_update(client, &data->fw_completion);
 521	if (error)
 522		return error;
 523
 524	error = data->ops->get_checksum(client, true, &fw_checksum);
 525	if (error)
 526		return error;
 527
 528	if (sw_checksum != fw_checksum) {
 529		dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
 530			sw_checksum, fw_checksum);
 531		return -EIO;
 532	}
 533
 534	return 0;
 535}
 536
 537static int elan_update_firmware(struct elan_tp_data *data,
 538				const struct firmware *fw)
 539{
 540	struct i2c_client *client = data->client;
 541	int retval;
 542
 543	dev_dbg(&client->dev, "Starting firmware update....\n");
 544
 545	guard(disable_irq)(&client->irq);
 546
 547	data->in_fw_update = true;
 548
 549	retval = __elan_update_firmware(data, fw);
 550	if (retval) {
 551		dev_err(&client->dev, "firmware update failed: %d\n", retval);
 552		data->ops->iap_reset(client);
 553	} else {
 554		/* Reinitialize TP after fw is updated */
 555		elan_initialize(data, false);
 556		elan_query_device_info(data);
 557	}
 558
 559	data->in_fw_update = false;
 560
 561	return retval;
 562}
 563
 564/*
 565 *******************************************************************
 566 * SYSFS attributes
 567 *******************************************************************
 568 */
 569static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
 570					   struct device_attribute *attr,
 571					   char *buf)
 572{
 573	struct i2c_client *client = to_i2c_client(dev);
 574	struct elan_tp_data *data = i2c_get_clientdata(client);
 575
 576	return sysfs_emit(buf, "0x%04x\n", data->fw_checksum);
 577}
 578
 579static ssize_t elan_sysfs_read_product_id(struct device *dev,
 580					 struct device_attribute *attr,
 581					 char *buf)
 582{
 583	struct i2c_client *client = to_i2c_client(dev);
 584	struct elan_tp_data *data = i2c_get_clientdata(client);
 585
 586	return sysfs_emit(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
 587			  data->product_id);
 588}
 589
 590static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
 591				      struct device_attribute *attr,
 592				      char *buf)
 593{
 594	struct i2c_client *client = to_i2c_client(dev);
 595	struct elan_tp_data *data = i2c_get_clientdata(client);
 596
 597	return sysfs_emit(buf, "%d.0\n", data->fw_version);
 598}
 599
 600static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
 601				      struct device_attribute *attr,
 602				      char *buf)
 603{
 604	struct i2c_client *client = to_i2c_client(dev);
 605	struct elan_tp_data *data = i2c_get_clientdata(client);
 606
 607	return sysfs_emit(buf, "%d.0\n", data->sm_version);
 608}
 609
 610static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
 611				       struct device_attribute *attr,
 612				       char *buf)
 613{
 614	struct i2c_client *client = to_i2c_client(dev);
 615	struct elan_tp_data *data = i2c_get_clientdata(client);
 616
 617	return sysfs_emit(buf, "%d.0\n", data->iap_version);
 618}
 619
 620static ssize_t elan_sysfs_update_fw(struct device *dev,
 621				    struct device_attribute *attr,
 622				    const char *buf, size_t count)
 623{
 624	struct elan_tp_data *data = dev_get_drvdata(dev);
 625	int error;
 626	const u8 *fw_signature;
 627	static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
 628
 629	if (data->fw_validpage_count == 0)
 630		return -EINVAL;
 631
 632	/* Look for a firmware with the product id appended. */
 633	const char *fw_name __free(kfree) =
 634		kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
 635	if (!fw_name) {
 636		dev_err(dev, "failed to allocate memory for firmware name\n");
 637		return -ENOMEM;
 638	}
 639
 640	dev_info(dev, "requesting fw '%s'\n", fw_name);
 641	const struct firmware *fw __free(firmware) = NULL;
 642	error = request_firmware(&fw, fw_name, dev);
 643	if (error) {
 644		dev_err(dev, "failed to request firmware: %d\n", error);
 645		return error;
 646	}
 647
 648	/* Firmware file must match signature data */
 649	fw_signature = &fw->data[data->fw_signature_address];
 650	if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
 651		dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
 652			(int)sizeof(signature), signature,
 653			(int)sizeof(signature), fw_signature);
 654		return -EBADF;
 655	}
 656
 657	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
 658		error = elan_update_firmware(data, fw);
 659		if (error)
 660			return error;
 661	}
 662
 663	return count;
 664}
 665
 666static int elan_calibrate(struct elan_tp_data *data)
 667{
 668	struct i2c_client *client = data->client;
 669	struct device *dev = &client->dev;
 670	int tries = 20;
 671	int retval;
 672	int error;
 673	u8 val[ETP_CALIBRATE_MAX_LEN];
 674
 675	guard(disable_irq)(&client->irq);
 676
 677	data->mode |= ETP_ENABLE_CALIBRATE;
 678	retval = data->ops->set_mode(client, data->mode);
 679	if (retval) {
 680		data->mode &= ~ETP_ENABLE_CALIBRATE;
 681		dev_err(dev, "failed to enable calibration mode: %d\n",
 682			retval);
 683		return retval;
 684	}
 685
 686	retval = data->ops->calibrate(client);
 687	if (retval) {
 688		dev_err(dev, "failed to start calibration: %d\n",
 689			retval);
 690		goto out_disable_calibrate;
 691	}
 692
 693	val[0] = 0xff;
 694	do {
 695		/* Wait 250ms before checking if calibration has completed. */
 696		msleep(250);
 697
 698		retval = data->ops->calibrate_result(client, val);
 699		if (retval)
 700			dev_err(dev, "failed to check calibration result: %d\n",
 701				retval);
 702		else if (val[0] == 0)
 703			break; /* calibration done */
 704
 705	} while (--tries);
 706
 707	if (tries == 0) {
 708		dev_err(dev, "failed to calibrate. Timeout.\n");
 709		retval = -ETIMEDOUT;
 710	}
 711
 712out_disable_calibrate:
 713	data->mode &= ~ETP_ENABLE_CALIBRATE;
 714	error = data->ops->set_mode(data->client, data->mode);
 715	if (error) {
 716		dev_err(dev, "failed to disable calibration mode: %d\n",
 717			error);
 718		if (!retval)
 719			retval = error;
 720	}
 721	return retval;
 722}
 723
 724static ssize_t calibrate_store(struct device *dev,
 725			       struct device_attribute *attr,
 726			       const char *buf, size_t count)
 727{
 728	struct i2c_client *client = to_i2c_client(dev);
 729	struct elan_tp_data *data = i2c_get_clientdata(client);
 730	int error;
 731
 732	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
 733		error = elan_calibrate(data);
 734		if (error)
 735			return error;
 736	}
 737
 738	return count;
 739}
 740
 741static ssize_t elan_sysfs_read_mode(struct device *dev,
 742				    struct device_attribute *attr,
 743				    char *buf)
 744{
 745	struct i2c_client *client = to_i2c_client(dev);
 746	struct elan_tp_data *data = i2c_get_clientdata(client);
 747	int error;
 748	enum tp_mode mode;
 749
 750	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
 751		error = data->ops->iap_get_mode(data->client, &mode);
 752		if (error)
 753			return error;
 754	}
 755
 756	return sysfs_emit(buf, "%d\n", (int)mode);
 757}
 758
 759static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
 760static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
 761static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
 762static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
 763static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
 764static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
 765static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
 766
 767static DEVICE_ATTR_WO(calibrate);
 768
 769static struct attribute *elan_sysfs_entries[] = {
 770	&dev_attr_product_id.attr,
 771	&dev_attr_firmware_version.attr,
 772	&dev_attr_sample_version.attr,
 773	&dev_attr_iap_version.attr,
 774	&dev_attr_fw_checksum.attr,
 775	&dev_attr_calibrate.attr,
 776	&dev_attr_mode.attr,
 777	&dev_attr_update_fw.attr,
 778	NULL,
 779};
 780
 781static const struct attribute_group elan_sysfs_group = {
 782	.attrs = elan_sysfs_entries,
 783};
 784
 785static int elan_acquire_baseline(struct elan_tp_data *data)
 786{
 787	struct i2c_client *client = data->client;
 788	struct device *dev = &client->dev;
 789	int retval;
 790	int error;
 791
 792	guard(disable_irq)(&client->irq);
 793
 794	data->baseline_ready = false;
 795
 796	data->mode |= ETP_ENABLE_CALIBRATE;
 797	retval = data->ops->set_mode(client, data->mode);
 798	if (retval) {
 799		data->mode &= ~ETP_ENABLE_CALIBRATE;
 800		dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
 801			retval);
 802		return retval;
 803	}
 804
 805	msleep(250);
 806
 807	retval = data->ops->get_baseline_data(client, true,
 808					      &data->max_baseline);
 809	if (retval) {
 810		dev_err(dev, "Failed to read max baseline from device: %d\n",
 811			retval);
 812		goto out_disable_calibrate;
 813	}
 814
 815	retval = data->ops->get_baseline_data(client, false,
 816					      &data->min_baseline);
 817	if (retval) {
 818		dev_err(dev, "Failed to read min baseline from device: %d\n",
 819			retval);
 820		goto out_disable_calibrate;
 821	}
 822
 823	data->baseline_ready = true;
 824
 825out_disable_calibrate:
 826	data->mode &= ~ETP_ENABLE_CALIBRATE;
 827	error = data->ops->set_mode(client, data->mode);
 828	if (error) {
 829		dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
 830			error);
 831		if (!retval)
 832			retval = error;
 833	}
 834
 835	return retval;
 836}
 837
 838static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
 839			     const char *buf, size_t count)
 840{
 841	struct i2c_client *client = to_i2c_client(dev);
 842	struct elan_tp_data *data = i2c_get_clientdata(client);
 843	int error;
 844
 845	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
 846		error = elan_acquire_baseline(data);
 847		if (error)
 848			return error;
 849	}
 850
 851	return count;
 852}
 853
 854static ssize_t min_show(struct device *dev,
 855			struct device_attribute *attr, char *buf)
 856{
 857	struct i2c_client *client = to_i2c_client(dev);
 858	struct elan_tp_data *data = i2c_get_clientdata(client);
 859
 860	scoped_guard(mutex_intr, &data->sysfs_mutex) {
 861		if (!data->baseline_ready)
 862			return -ENODATA;
 863
 864		return sysfs_emit(buf, "%d", data->min_baseline);
 865	}
 866
 867	return -EINTR;
 868}
 869
 870static ssize_t max_show(struct device *dev,
 871			struct device_attribute *attr, char *buf)
 872{
 873	struct i2c_client *client = to_i2c_client(dev);
 874	struct elan_tp_data *data = i2c_get_clientdata(client);
 875
 876	scoped_guard(mutex_intr, &data->sysfs_mutex) {
 877		if (!data->baseline_ready)
 878			return -ENODATA;
 879
 880		return sysfs_emit(buf, "%d", data->max_baseline);
 881	}
 882
 883	return -EINTR;
 884}
 885
 886static DEVICE_ATTR_WO(acquire);
 887static DEVICE_ATTR_RO(min);
 888static DEVICE_ATTR_RO(max);
 889
 890static struct attribute *elan_baseline_sysfs_entries[] = {
 891	&dev_attr_acquire.attr,
 892	&dev_attr_min.attr,
 893	&dev_attr_max.attr,
 894	NULL,
 895};
 896
 897static const struct attribute_group elan_baseline_sysfs_group = {
 898	.name = "baseline",
 899	.attrs = elan_baseline_sysfs_entries,
 900};
 901
 902static const struct attribute_group *elan_sysfs_groups[] = {
 903	&elan_sysfs_group,
 904	&elan_baseline_sysfs_group,
 905	NULL
 906};
 907
 908/*
 909 ******************************************************************
 910 * Elan isr functions
 911 ******************************************************************
 912 */
 913static void elan_report_contact(struct elan_tp_data *data, int contact_num,
 914				bool contact_valid, bool high_precision,
 915				u8 *packet, u8 *finger_data)
 916{
 917	struct input_dev *input = data->input;
 918	unsigned int pos_x, pos_y;
 919	unsigned int pressure, scaled_pressure;
 920
 921	if (contact_valid) {
 922		if (high_precision) {
 923			pos_x = get_unaligned_be16(&finger_data[0]);
 924			pos_y = get_unaligned_be16(&finger_data[2]);
 925		} else {
 926			pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
 927			pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
 928		}
 929
 930		if (pos_x > data->max_x || pos_y > data->max_y) {
 931			dev_dbg(input->dev.parent,
 932				"[%d] x=%d y=%d over max (%d, %d)",
 933				contact_num, pos_x, pos_y,
 934				data->max_x, data->max_y);
 935			return;
 936		}
 937
 938		pressure = finger_data[4];
 939		scaled_pressure = pressure + data->pressure_adjustment;
 940		if (scaled_pressure > ETP_MAX_PRESSURE)
 941			scaled_pressure = ETP_MAX_PRESSURE;
 942
 943		input_mt_slot(input, contact_num);
 944		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 945		input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 946		input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
 947		input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
 948
 949		if (data->report_features & ETP_FEATURE_REPORT_MK) {
 950			unsigned int mk_x, mk_y, area_x, area_y;
 951			u8 mk_data = high_precision ?
 952				packet[ETP_MK_DATA_OFFSET + contact_num] :
 953				finger_data[3];
 954
 955			mk_x = mk_data & 0x0f;
 956			mk_y = mk_data >> 4;
 957
 958			/*
 959			 * To avoid treating large finger as palm, let's reduce
 960			 * the width x and y per trace.
 961			 */
 962			area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
 963			area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
 964
 965			input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
 966			input_report_abs(input, ABS_MT_TOUCH_MAJOR,
 967					 max(area_x, area_y));
 968			input_report_abs(input, ABS_MT_TOUCH_MINOR,
 969					 min(area_x, area_y));
 970		}
 971	} else {
 972		input_mt_slot(input, contact_num);
 973		input_mt_report_slot_inactive(input);
 974	}
 975}
 976
 977static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
 978				 bool high_precision)
 979{
 980	struct input_dev *input = data->input;
 981	u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
 982	int i;
 983	u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
 984	u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
 985	bool contact_valid, hover_event;
 986
 987	pm_wakeup_event(&data->client->dev, 0);
 988
 989	hover_event = hover_info & BIT(6);
 990
 991	for (i = 0; i < ETP_MAX_FINGERS; i++) {
 992		contact_valid = tp_info & BIT(3 + i);
 993		elan_report_contact(data, i, contact_valid, high_precision,
 994				    packet, finger_data);
 995		if (contact_valid)
 996			finger_data += ETP_FINGER_DATA_LEN;
 997	}
 998
 999	input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1000	input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1001	input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1002	input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1003	input_mt_report_pointer_emulation(input, true);
1004	input_sync(input);
1005}
1006
1007static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1008{
1009	struct input_dev *input = data->tp_input;
1010	u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1011	int x, y;
1012
1013	pm_wakeup_event(&data->client->dev, 0);
1014
1015	if (!data->tp_input) {
1016		dev_warn_once(&data->client->dev,
1017			      "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1018		return;
1019	}
1020
1021	input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1022	input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1023	input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1024
1025	if ((packet[3] & 0x0F) == 0x06) {
1026		x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1027		y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1028
1029		input_report_rel(input, REL_X, x);
1030		input_report_rel(input, REL_Y, y);
1031	}
1032
1033	input_sync(input);
1034}
1035
1036static irqreturn_t elan_isr(int irq, void *dev_id)
1037{
1038	struct elan_tp_data *data = dev_id;
1039	int error;
1040	u8 report[ETP_MAX_REPORT_LEN];
1041
1042	/*
1043	 * When device is connected to i2c bus, when all IAP page writes
1044	 * complete, the driver will receive interrupt and must read
1045	 * 0000 to confirm that IAP is finished.
1046	*/
1047	if (data->in_fw_update) {
1048		complete(&data->fw_completion);
1049		goto out;
1050	}
1051
1052	error = data->ops->get_report(data->client, report, data->report_len);
1053	if (error)
1054		goto out;
1055
1056	switch (report[ETP_REPORT_ID_OFFSET]) {
1057	case ETP_REPORT_ID:
1058		elan_report_absolute(data, report, false);
1059		break;
1060	case ETP_REPORT_ID2:
1061		elan_report_absolute(data, report, true);
1062		break;
1063	case ETP_TP_REPORT_ID:
1064	case ETP_TP_REPORT_ID2:
1065		elan_report_trackpoint(data, report);
1066		break;
1067	default:
1068		dev_err(&data->client->dev, "invalid report id data (%x)\n",
1069			report[ETP_REPORT_ID_OFFSET]);
1070	}
1071
1072out:
1073	return IRQ_HANDLED;
1074}
1075
1076/*
1077 ******************************************************************
1078 * Elan initialization functions
1079 ******************************************************************
1080 */
1081
1082static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1083{
1084	struct device *dev = &data->client->dev;
1085	struct input_dev *input;
1086
1087	input = devm_input_allocate_device(dev);
1088	if (!input)
1089		return -ENOMEM;
1090
1091	input->name = "Elan TrackPoint";
1092	input->id.bustype = BUS_I2C;
1093	input->id.vendor = ELAN_VENDOR_ID;
1094	input->id.product = data->product_id;
1095	input_set_drvdata(input, data);
1096
1097	input_set_capability(input, EV_REL, REL_X);
1098	input_set_capability(input, EV_REL, REL_Y);
1099	input_set_capability(input, EV_KEY, BTN_LEFT);
1100	input_set_capability(input, EV_KEY, BTN_RIGHT);
1101	input_set_capability(input, EV_KEY, BTN_MIDDLE);
1102
1103	__set_bit(INPUT_PROP_POINTER, input->propbit);
1104	__set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1105
1106	data->tp_input = input;
1107
1108	return 0;
1109}
1110
1111static int elan_setup_input_device(struct elan_tp_data *data)
1112{
1113	struct device *dev = &data->client->dev;
1114	struct input_dev *input;
1115	unsigned int max_width = max(data->width_x, data->width_y);
1116	unsigned int min_width = min(data->width_x, data->width_y);
1117	int error;
1118
1119	input = devm_input_allocate_device(dev);
1120	if (!input)
1121		return -ENOMEM;
1122
1123	input->name = "Elan Touchpad";
1124	input->id.bustype = BUS_I2C;
1125	input->id.vendor = ELAN_VENDOR_ID;
1126	input->id.product = data->product_id;
1127	input_set_drvdata(input, data);
1128
1129	error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1130				    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1131	if (error) {
1132		dev_err(dev, "failed to initialize MT slots: %d\n", error);
1133		return error;
1134	}
1135
1136	__set_bit(EV_ABS, input->evbit);
1137	__set_bit(INPUT_PROP_POINTER, input->propbit);
1138	if (data->clickpad) {
1139		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1140	} else {
1141		__set_bit(BTN_RIGHT, input->keybit);
1142		if (data->middle_button)
1143			__set_bit(BTN_MIDDLE, input->keybit);
1144	}
1145	__set_bit(BTN_LEFT, input->keybit);
1146
1147	/* Set up ST parameters */
1148	input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1149	input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1150	input_abs_set_res(input, ABS_X, data->x_res);
1151	input_abs_set_res(input, ABS_Y, data->y_res);
1152	input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1153	if (data->report_features & ETP_FEATURE_REPORT_MK)
1154		input_set_abs_params(input, ABS_TOOL_WIDTH,
1155				     0, ETP_FINGER_WIDTH, 0, 0);
1156	input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1157
1158	/* And MT parameters */
1159	input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1160	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1161	input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1162	input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1163	input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1164			     ETP_MAX_PRESSURE, 0, 0);
1165	if (data->report_features & ETP_FEATURE_REPORT_MK) {
1166		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1167				     0, ETP_FINGER_WIDTH * max_width, 0, 0);
1168		input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1169				     0, ETP_FINGER_WIDTH * min_width, 0, 0);
1170	}
1171
1172	data->input = input;
1173
1174	return 0;
1175}
1176
1177static void elan_disable_regulator(void *_data)
1178{
1179	struct elan_tp_data *data = _data;
1180
1181	regulator_disable(data->vcc);
1182}
1183
1184static int elan_probe(struct i2c_client *client)
1185{
1186	const struct elan_transport_ops *transport_ops;
1187	struct device *dev = &client->dev;
1188	struct elan_tp_data *data;
1189	unsigned long irqflags;
1190	int error;
1191
1192	if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1193	    i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1194		transport_ops = &elan_i2c_ops;
1195	} else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1196		   i2c_check_functionality(client->adapter,
1197					   I2C_FUNC_SMBUS_BYTE_DATA |
1198						I2C_FUNC_SMBUS_BLOCK_DATA |
1199						I2C_FUNC_SMBUS_I2C_BLOCK)) {
1200		transport_ops = &elan_smbus_ops;
1201	} else {
1202		dev_err(dev, "not a supported I2C/SMBus adapter\n");
1203		return -EIO;
1204	}
1205
1206	data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1207	if (!data)
1208		return -ENOMEM;
1209
1210	i2c_set_clientdata(client, data);
1211
1212	data->ops = transport_ops;
1213	data->client = client;
1214	init_completion(&data->fw_completion);
1215	mutex_init(&data->sysfs_mutex);
1216
1217	data->vcc = devm_regulator_get(dev, "vcc");
1218	if (IS_ERR(data->vcc))
1219		return dev_err_probe(dev, PTR_ERR(data->vcc), "Failed to get 'vcc' regulator\n");
1220
1221	error = regulator_enable(data->vcc);
1222	if (error) {
1223		dev_err(dev, "Failed to enable regulator: %d\n", error);
1224		return error;
1225	}
1226
1227	error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1228	if (error) {
1229		dev_err(dev, "Failed to add disable regulator action: %d\n",
1230			error);
1231		return error;
1232	}
1233
1234	/* Make sure there is something at this address */
1235	error = i2c_smbus_read_byte(client);
1236	if (error < 0) {
1237		dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1238		return -ENXIO;
1239	}
1240
1241	/* Initialize the touchpad. */
1242	error = elan_initialize(data, false);
1243	if (error)
1244		return error;
1245
1246	error = elan_query_device_info(data);
1247	if (error)
1248		return error;
1249
1250	error = elan_query_device_parameters(data);
1251	if (error)
1252		return error;
1253
1254	dev_info(dev,
1255		 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1256		 data->product_id,
1257		 data->fw_version,
1258		 data->sm_version,
1259		 data->iap_version);
1260
1261	dev_dbg(dev,
1262		"Elan Touchpad Extra Information:\n"
1263		"    Max ABS X,Y:   %d,%d\n"
1264		"    Width X,Y:   %d,%d\n"
1265		"    Resolution X,Y:   %d,%d (dots/mm)\n"
1266		"    ic type: 0x%x\n"
1267		"    info pattern: 0x%x\n",
1268		data->max_x, data->max_y,
1269		data->width_x, data->width_y,
1270		data->x_res, data->y_res,
1271		data->ic_type, data->pattern);
1272
1273	/* Set up input device properties based on queried parameters. */
1274	error = elan_setup_input_device(data);
1275	if (error)
1276		return error;
1277
1278	if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1279		error = elan_setup_trackpoint_input_device(data);
1280		if (error)
1281			return error;
1282	}
1283
1284	/*
1285	 * Platform code (ACPI, DTS) should normally set up interrupt
1286	 * for us, but in case it did not let's fall back to using falling
1287	 * edge to be compatible with older Chromebooks.
1288	 */
1289	irqflags = irq_get_trigger_type(client->irq);
1290	if (!irqflags)
1291		irqflags = IRQF_TRIGGER_FALLING;
1292
1293	error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1294					  irqflags | IRQF_ONESHOT,
1295					  client->name, data);
1296	if (error) {
1297		dev_err(dev, "cannot register irq=%d\n", client->irq);
1298		return error;
1299	}
1300
1301	error = input_register_device(data->input);
1302	if (error) {
1303		dev_err(dev, "failed to register input device: %d\n", error);
1304		return error;
1305	}
1306
1307	if (data->tp_input) {
1308		error = input_register_device(data->tp_input);
1309		if (error) {
1310			dev_err(&client->dev,
1311				"failed to register TrackPoint input device: %d\n",
1312				error);
1313			return error;
1314		}
1315	}
1316
1317	return 0;
1318}
1319
1320static int __elan_suspend(struct elan_tp_data *data)
1321{
1322	struct i2c_client *client = data->client;
1323	int error;
1324
1325	if (device_may_wakeup(&client->dev))
1326		return elan_sleep(data);
1327
1328	/* Touchpad is not a wakeup source */
1329	error = elan_set_power(data, false);
1330	if (error)
1331		return error;
1332
1333	error = regulator_disable(data->vcc);
1334	if (error) {
1335		dev_err(&client->dev,
1336			"failed to disable regulator when suspending: %d\n",
1337			error);
1338		/* Attempt to power the chip back up */
1339		elan_set_power(data, true);
1340		return error;
1341	}
1342
1343	return 0;
1344}
1345
1346static int elan_suspend(struct device *dev)
1347{
1348	struct i2c_client *client = to_i2c_client(dev);
1349	struct elan_tp_data *data = i2c_get_clientdata(client);
1350	int error;
1351
1352	/*
1353	 * We are taking the mutex to make sure sysfs operations are
1354	 * complete before we attempt to bring the device into low[er]
1355	 * power mode.
1356	 */
1357	scoped_cond_guard(mutex_intr, return -EINTR, &data->sysfs_mutex) {
1358		disable_irq(client->irq);
1359
1360		error = __elan_suspend(data);
1361		if (error) {
1362			enable_irq(client->irq);
1363			return error;
1364		}
1365	}
1366
1367	return 0;
1368}
1369
1370static int elan_resume(struct device *dev)
1371{
1372	struct i2c_client *client = to_i2c_client(dev);
1373	struct elan_tp_data *data = i2c_get_clientdata(client);
1374	int error;
1375
1376	if (!device_may_wakeup(dev)) {
1377		error = regulator_enable(data->vcc);
1378		if (error) {
1379			dev_err(dev, "error %d enabling regulator\n", error);
1380			goto err;
1381		}
1382	}
1383
1384	error = elan_set_power(data, true);
1385	if (error) {
1386		dev_err(dev, "power up when resuming failed: %d\n", error);
1387		goto err;
1388	}
1389
1390	error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1391	if (error)
1392		dev_err(dev, "initialize when resuming failed: %d\n", error);
1393
1394err:
1395	enable_irq(data->client->irq);
1396	return error;
1397}
1398
1399static DEFINE_SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1400
1401static const struct i2c_device_id elan_id[] = {
1402	{ DRIVER_NAME },
1403	{ }
1404};
1405MODULE_DEVICE_TABLE(i2c, elan_id);
1406
1407#ifdef CONFIG_ACPI
1408#include <linux/input/elan-i2c-ids.h>
1409MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1410#endif
1411
1412#ifdef CONFIG_OF
1413static const struct of_device_id elan_of_match[] = {
1414	{ .compatible = "elan,ekth3000" },
1415	{ /* sentinel */ }
1416};
1417MODULE_DEVICE_TABLE(of, elan_of_match);
1418#endif
1419
1420static struct i2c_driver elan_driver = {
1421	.driver = {
1422		.name	= DRIVER_NAME,
1423		.pm	= pm_sleep_ptr(&elan_pm_ops),
1424		.acpi_match_table = ACPI_PTR(elan_acpi_id),
1425		.of_match_table = of_match_ptr(elan_of_match),
1426		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1427		.dev_groups = elan_sysfs_groups,
1428	},
1429	.probe		= elan_probe,
1430	.id_table	= elan_id,
1431};
1432
1433module_i2c_driver(elan_driver);
1434
1435MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1436MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1437MODULE_LICENSE("GPL");